Re: Sqeeky upper wishbones...
Have just done the upper wishbones on my 156 today.
It's not that hard a job, apart from the previously mentioned couple of very tight bolts.
One thing that I've done differently to the guide linked is to leave the bolt through the upper arm bushes loose until it's sitting at normal ride height, then tighten it right up.
Reason for this is, the squeaking on mine was caused by the metal inner of the bushes tearing free from the rubber part and squeaking whenever it moved with the suspension. I'd assume most fail in a similar manner.
The metal inner is bonded to the rubber bush, so if you tighten it up at full suspension travel, by the time you've lowered it down to the ground you've got a hell of a lot of twisting in the bush at normal ride height - and that's gonna help kill it again.
If you tighten it up at normal ride height, then the bush isn't twisted at all when the car is sitting still, so it should last longer.
Please feel free to comment if I've missed the boat, but this is the same principal you use with other bushes on other cars.
Make something idiot proof and someone will only go and build a better idiot...